Pole changer



May 29, 1934. J SHAVER 1,960,960

POLE CHANGER Fil ed Oct. 28. 1932 JUL/En 75f: M w Ll'mhrz EhEL/EP LP 5 W HUUrnEy.

Patented May 29, 1934 POLE CHANGER John Shaver, Chicago, 111., assignor to Kellogg Switchboard and Supply Company, Chicago, 111., a corporation of Illinois Application October 28, 1932, Serial No. 639,966

12 Claims. (01. 179-84) My invention relates to switching circuits and brator n a s. Th pol n r E i h merhas to do more particularly with circuits in which s n v p a r and c mp s th vibrating duplicate sets of apparatus are employed and in agnets VM and VM and their associated viwhich mean r provided for automatically brator contacts. Additional vibrator units may switching from one set of apparatus to another. he slipillied t0 the number of different frequencies 60 In telephone systems of th 1 in which pgle desired. I show a transformer T which is comchangers are used for delivering ringing current men t0 the Vibrating ag ts VM and VM and a duplicate pole changer t are employed one of transformer T which is common to the units which may be termed the primary pole changer and VM3 the p er P and E. I

and the other the emergency pole changer. It e150 P P Changer Switching ay R 65 sometimes happens that the primary pole chang WhiCh is associated With the units VM and VM2 or becomes disabled for various reasons, such as and Which when Operated w s the Ci cuit of mechanical trouble or circuit trouble and stops the tlenefelmel T from the p y t t e eme thus making it necessary to employ the emergency gehey D Changer 0f the Same q ypole changer, The pole changer switching relay PR performs 70 I th ystem of my invention should th i a similar function for the transformer T and the mary pole changer cease operating the emergen associated unite and cy pole changer is immediately set in operation The Starting reley SR Starts t Vibrating gwithout the intervention of any operator or at-- nets of the primary p Changer to ODeratiDn tendant. Certain of the systems heretofore emand the Control leley CR controls the Operation 75 ployed were found to be more or less impractical after they are Ghee Started- An emergency because the vibrating magnets supplying the low- Starting relay ESR Which is Operated po the deer frequencies were provided with vibrating reeds eneTgiZetiOh of either One Of the a ating ourof such a size that they did not always start readirent relays AC or AC starts the eme gency D018 1y. The system of my invention has been designed Change? ihtO p The relays AC a 80 to overcome this deficiency as Well as others. are normally p d de the influence of A feature of my invention is the provision of a alternating Current flowing in the Secondary key which when moved to one position places the Winding Of t e ele T and T. Should primary pole changer i operation d hi h either of these relays deenergize the switching 0 when moved to its other position disconnects the e y SW is else deenel'gized to energize the 85 primary pole changer and causes the emergency emergency Starting relay 5133- A11 emergency pole changer t0 operate, that the primary p013 COIl'tlOl relay ECR COIltIOlS the vibrating units Of changer may be used for a certain period and the emergency p Changer E. when desirable the emergency pole changer can I also D a switching y SK which is of be placed in operation. the usual cam type and has two positions 10 and e. 90

Another feature of my invention is the provih the y is moved to its 2 position h p sion of means whereby the emergency pole changa y D Changer P is Set in p a on and when or is automatically caused to operate should the the y SK is moved to its p i n 6 the emerprimary pole changer cease to function for any g y P Changer E s S t into operation. A

40 ea test key TK, hell or buzzer Bu and a signal S are 95 Another feature of my invention is the use of pr vide f p rv p p s and are under one set of transformers for both the primary and the control of the supervisory relay SR. emergency pole changers and automatic means I also provide an additional electromagnetic for connecting the transformers in circuit with coil such as c for the vibrating magnet VM or c the pole changer operating at any time. for the vibrating magnet Vivi which are to in- 100 Another feature of my invention i th proviitially attract the vibrating reeds and cause them sion of an additional electromagnetic coil on the to positively operate under the influence of the vibrating magnets which furnish ringing curcoils comprising the magnets. rent of the lower frequencies to initially attract The vibrating reeds of the magnets furnishing the vibrating reed to positively set the reed in current of low frequency such as 16 cycle or 30 5 vibration. cycle must be heavily weighted to keep them Referring now in general to my invention as vibrating at the desired rate, and consequently a illustrated in the accompanying drawing I show considerably greater electromagnetic force is rea. primary pole changer P comprising vibrating quired to initially attract the vibrating reed than magnets VM and VM' and their associated viis necessary to keep it in operation after it is started. The coil of the vibrator VM initially attracts the reed r and holds it in its operated position until the energizing circuit is closed for the control relay CR which establishes the operating circuit for the vibrator VM thru the reed r. The starting relay SR is slow to release and interrupts the circuit thru the coil 0 to release the reed r at approximately the same time the relay CR establishes the operating circuit for the vibrator. The reed 1' being in motion at the time the circuit is closed will continue to vibrate under the influence of the vibrator VM.

The detailed operation of the switching circuit of my invention is as follows. Assume that it is desired to place the primary pole changer P in operation. The switching key SK will be moved to its position 12 to close an energizing circuit for the starting relay SR which circuit can be traced from grounded battery thru the winding of starting relay SR, normally closed contact 2 of control relay CR, conductor 3, normally closed contact 4 of relay ECR, alternate contact 5 of key K, conductor 6, normally closed contact 7 of switching relay SWA to ground. The starting relay energizes and attracts its armatures 8, 9 and 10. The closure of alternate contact 9 causes the current to flow from grounded battery thru the coil 0 of vibrating magnet VM, conductor 11, alternate contact 9 of SR to ground. The flow of current causes the vibrating reed r of the vibrating magnet VM to be attracted and moved to engage its left hand contact as shown in the drawing where it is held. Current flowing from grounded battery thru the winding of vibrating magnet VM, conductor 14, alternate contact 10 of SR to ground causes the energization of the vibrating magnet VM' which attracts its armature or vibrating reed 'r and causes it to engage its left hand contact 30 and to be held in its attracted position.

The closure of alternate contact 8 of starting relay SR establishes an energizing circuit for the control relay CR which circuit can be traced from grounded battery thru the winding of the control relay CR, alternate contacts 8 and 9 of SR to ground. The control relay CR opens the energizing circuit to the starting relay SR and closes a locking circuit for itself thru its alternate contact 12. The contact 2 is disengaged from the spring 13 which interrupts the energizing circuit of the relay SR which restores to normal. The holding circuit for the relay CR can be traced from grounded battery thru the winding of CR, alternate contact 12, conductor 3, normal contact 4 of ECR, alternate contact 5 of key K, conductor 6, normal contact '7 of SWA to ground.

The deenergization of SR, which is delayed due to its slow to release construction, opens the circuit for the coil 0 which releases the vibrating reed r. As the reed 1" reaches its extreme right position an energizing circuit for the vibrating magnet VM is established and current flows from grounded battery thru the magnet VM, normal contact 22, reed 1', conductor 18, alternate contact 19 of control relay CR. The reed T will be attracted by the coil of VM thereby opening the energizing circuit which will be restored to again energize the magnet when the reed returns to engage contact 21. The reed 1' will alternately engage the contacts 1'? and 21 at predetermined intervals to set up a flow of alternating current of the desired frequency. When the reed r en gages the contact 17 current will flow from grounded battery thru the primary winding (1 of transformer T, normal contact of relay PR,

conductor 16, closed contact 17, reed r, conductor 18, alternate contact 19 of CR to ground.

When the reed r engages the contact 21 current is caused to flow from grounded battery thru the primary winding 1) of transformer T, normal contact of PR, contact 21, reed 1, conductor 18, alternate contact 19 of CR to ground. The fiow of current thru the coil (1 and then b will cause alternating current to be set up in the secondary coil s of the transformer T. As the control relay CR energizes it closes an operating circuit for vibrator VM at about the same time the slow to release relay SR interrupts the original circuit to release the reed r. This operating circuit for the vibrating magnet VM can be traced from grounded battery thru the winding of the magnet VM, closed contact 23, reed. 1", conductor 27, conductor 18, alternate contact 19 of CR to ground. The reed T will be caused to vibrate and alternately deenergize and energize the vibrating magnet VM. As the reed 1" engages the contact 26 a circuit will be established for the flow of current from battery thru primary winding 1) of transformer T, normal contact 24 of PR, conductor 25, contact 26, reed 1", conductors 27 and 18, alternate contact 19 to ground. As the reed 1" engages the contact current will be caused to flow from grounded battery thru the primary winding a of transformer T, normal contact 28 of PR, conductor 29, contact 30, reed r, conductors 2'7 and 18, alternate contact 19 of OR to ground. The alternate engagement of contacts 26 and 30 by the reed 1" and the now of current thru the said contacts and the coils a and b of transformer T will set up an alternating current of the desired frequency in the secondary coil .9 of the transformer T.

The secondary coils s and s of the transformers T and T are connected. by leads 31 and 32 respectively to any apparatus which is to be supplied with current of the desired frequency. The relay AC is connected to the secondary s of the transformer T thru a condenser 33 and the alternating current set up in this secondary winding 5 passes thru the winding of the relay AC and energizes the same which thereupon closes its alternate contact 35. The relay AC is connected to the secondary winding s of the transformer T thru a condenser 34 and the alternating current flowing thru the winding of the relay AC causes its energization and the subsequent closure of contact 36. The relays AC and AC are maintained energized as long as ciu'rent is flowing thru the secondary windings s and s of the transformers. When both the contacts 35 and 36 are closed an energizing circuit for the switching relay SW is established. The relay SW is of slow to release construction to prevent the operation of the switching relay SWA should the conductor cc be momentarily opened. The relay SW is energized from grounded battery thru the winding of relay SWA, normally closed contact 42, alternate closed contact 41 of SW to ground. The relay SWA energizes and closes a locking circuit for itself thru its alternate closed contact 43, alternate closed contact 44 of key K to ground.

ion

The relay SWA opens its normal contact 7 and closes its alternate contact to establish a holding circuit for the control relay CR. The control relay GR is maintained energized by current flowing from grounded battery thru the winding of CR, alternate contacts 12 and 13, conductor 3, normally closed contact 4 of ECR, alternate closed contact 5 of key K, conductor 6, alternate closed contact of SWA, conductor 46, alternate closed contact 41 of SW to ground. It is to be understood that additional vibrators such as VM, VM', etc. can be utilized in my system and that a transformer such as I or T and the associated AC relay will be necessary for each additional vibrator used. A contact s ch as 35 of AC must be provided for each additional relay such as AC and must be connected in series circuit with the contacts 35 and 36 in the common conductor cc.

Should any of the vibrators fail to supply alternating current to anyone of the transformers the alternating current relay associated with the secondary winding of said transformer will be deenergized and open its associated contact to interrupt the control conductor cc. For instance if i the vibrator VM ceases to function for any rea" contact 35 to interrupt the control conductor cc and the energizing circuit for the switching relay SW which would deenergize and restore its contact 41 to normal thereby opening the energizing circuit of the control relay CR which would also restore to normal to open the operating circuit of the vibrators VM and VM', etc. of the primary pole changer P.

Immediately upon the deenergization of the switching relay SW an energizing circuit for the emergency starting relay ESR is established. This circuit can be traced from grounded battery thru the winding of the relay ESR, normally closed contact 47 of ECR, conductor 48, closed contact 49 of CR, conductor 50, normally closed contact 51 of key K, conductor 52, alternate closed con tact 53 of SWA, normal contact 41 of SW to ground. The emergency starting relay ESR closes initial opening circuits for the vibrator VM The energizing circuit for the vibrator Vlf can be traced from grounded battery thru winding of VM conductor 58, alternate contact 56 of ESE.

to ground. An energizing circuit is also established for the coil c of the vibrator VlVi which circuit can be traced from grounded battery thru the coil 0 conductor 57, alternate closed contact of ESR to ground. The coil c assures the attraction and subsequent operation of the heavily weighted reed r as explained in connection with the vibrator VM which furnishes alternating current of the same frequency as the vibrator VM The energization of ESE also establishes an energizing circuit for the emergency control relay ECR, thru its alternate contacts 54 and 55. The relay ECR closes a locking circuit thru its alternate contact 59, conductor 48, normally closed contact 49 of CR, conductor o0, normal closed contact 51 of key K, conductor 52, alternate con tact 53 of SWA, normally closed contact 53 of SWA, normally closed contact 41 of SW to ground.

Relay ECR closes its alternate contact 40 to establish energizing circuits for the relays PR, SR

and PR which circuits can be traced from grounded battery thru the windings of the relays, conductors and '73, to ground at alternate closed contact 40 of ECR. The relay PR operates to close its alternate contacts 15 and 29 thereby disconnecting the primary windings a and b of the transformer T from the contacts 17 and 21 of the vibrator VM and connects the said primary windings a and b to contacts '74 and '75 of the vibrator VM' The pole changer switching relay 801 PR closes its alternate contacts 24 and 28 thereby disconnecting the primary windings a and b of transformer T from the contacts 26 and 30 of vibrator VM and connects the said primary windings a and b to contacts '76 and 7'7 of vi- 35 brator WM? The said transformers are there after supplied with current from the vibrators of the emergency pole changer E. The operating circuit for the vibrators VM and VM can traced from grounded battery t ru the winding of VM intermittently closed contact '72, reed 7' conductors 7i and 73 to ground at alternate contact 4c of EUR; the circuit for VM being from grounded battery thru the coil of Vii/i intermittently closed contact '70, reed r, conductor 73, to ground at alternate closed contact 40 of ECR. The energization of supervisory relay SR causes the actuation of a signal S by current flowing from grounded battery thru alternate contact 62, the signal S to ground. This signal S informs the that the primary pole changer has stopped working and that the emergency pole changer E is in operation. A test key TK is also provided with an associated buzzer Bu which enables a remote operator to test the system and determine which of the pole changers is in operation.

Should it be desired to initially operate the emergency pole changer E the key K Will be thrown to its position e thereby establishing an energizing circuit for the emergency starting relay ESR which circuit can be traced from grounded battery thru the winding of ESR, normally closed contact 47 of EUR, conductor 48, normally closed contact 49 of CR, conductor 50, alternate contact 51 of key K, conductor 6, normally closed contact 7 of SWA to ground. The vibrators VM? and VM will operate over the circuits previous' ly traced for them as will the emergency control relay ECR and the pole changer switching relays PR and PR.

If the emergency pole changer E, which is now the primary pole changer, ceases to operate propthe pole changer P which is now the emergency pole changer will operate in a manner evi- 125 dent from the foregoing explanation of the operation of the system.

While I have described my invention in certain particular embodiments, I desire it understood that modifications and alterations may be made and that I intend no limitations upon my invention other than those imposed by the scope of the appended claims.

Having described my invention, What I claim as new and desire to secure by United States Letters Patent is:

l. A switching system of the character described including a pole changer comprising a vibrator magnet having an electromagnetic coil, a vibrating reed and associated contacts, a second electromagnetic coil associated with said vibrator magnet for initially operating said vibrating reed.

2. A switching system of the character described including a pole changer comprising a vibrator magnet having an electromagnetic coil, a vibrating reed and contacts associated therewith, a second electromagnetic coil associated with said vibrator magnet for initially operating said vlbrating reed and means controlling the energization of said electromagnetic coils.

3; A switching system of the character described including a pole changer comprising a vibrator magnet having an electromagnetic coil, ajvibrating reed and contacts associated therewith, a second electromagnetic coil for'initially operatingsaid vibrating reed, an electrically operated circuit for said second electromagnetic coil and relay means controlling said operating circuit.;

'4. A switching system of the character described including a pole changer comprising a vibrator magnet, an operating coil therefor, a vibrating reed associated therewith, an electromagnetic coil for initially operating said vibrating reed, electrically operated circuits for said electromagnetic coil and said operating coil of said vibrator magnet, a starting relay controlling the operating circuit of said electromagnetic coil and a relay controlling the operating circuit of said operating coil of said vibrator magnet.

5. A- switching system of thecharacter described including a pole changer comprising a vibrator magnet, an operating coil therefor, a vibrating reed associated therewith and operated thereby, an electromagnetic coil for initially operatingsaid vibrating reed, electrically operated circuits forsaid electromagnetic coil and said operating coil of said vibrator magnet, and relay means for opening the operating circuit of said coil and closing the operating circuit of said 'operating coil of said vibrator magnet. 1

6. In a device of the class described, an electromagnetic vibrator, an operating coil therefor, a vibratory member and contacts associated therewith, said member and contacts being arranged to alternately make and break the circuit of said coil, and an electromagnetic coil and a circuit therefor for initially operating said vibratory member.

'7; Ina device of the class described, an electromagnetic vibrator, an operating coil therefor, a vibratory member and contacts associated therewith, saidmember and contacts being arrangedto'alternately make and break the circuit 01 said coil, an electromagnetic coil and a circuit therefor for initially operating said vibratory member, and means for rendering said second coil ineffective after a momentary operation thereof.

SBA switching system of the character described including a pair of pole changers, a key controlling the connection of either pole changer, an auxiliary coil associated with each pole changer for starting the operation of said pole changer, an electrical circuit for said auxiliary coils, and a relay controlling said electrical circuit and control means operating automatically to switch from one pole changer to another.

9. A system including a pair of ringing current supply devices, an operating coil for said devices and a momentarily energized starting coil for said devices, a key for rendering operative-either of said supply devices, a supply-circuit, means controlled by said supply circuit for disassociating one of said devices from said supply circuit and for connecting the other of said devices thereto. i

10. A switching system of the character described including a primary pole changer and an auxiliary pole changer, starting means individual to said pole changers, respectively, a key for connecting either pole changer in circuit, a relayfor each pole changer controlled by said key and controlling said individual starting means, a pair of transformers common to said pole changers, relays associated with said transformers and energized by current therefrom when a pole changer is operating and means controlled by said relays for automatically switching the transformer from the primary pole changer to the auxiliary pole changer incident to the disabling of theprimary pole changer.

11. A switching system of the character described including a primary pole changer and an emergency pole changer, a key for selectively rendering operative either of said pole changers, a starting relay for initially operating the selected pole changer, a relay controllingthe continued operation of the selected pole changer, transformers associated with said pole changers, relays, one for each of said transformers, energized by current therefrom, switching relays controlled by said last mentioned relays for switching to the emergency pole changer upon failure of said primary pole changer, an emergency starting relay for initially starting the emergency pole changer and an emergency control relay controlling the continued operation of said emergency pole changer. e

12. A switching system of the character described including a primary pole changer and an emergency pole changer, eachcomprising vibrator magnets, a vibrating reed and an auxiliary electromagnetic coil for initially attracting said vibrating reed, electrically operatedcircuits for said auxiliary coils, a starting relay for each of said coils controlling the electrically operated circuit therefor, a relay controlling the continued operation of the said pole changer, transformers common to said pole changers, relays energized by current from said transformers, switching relays controlled by said transformer controlled relays for actuating an emergency starting relay for initially starting the emergency pole changer and an emergency control relay controlling the continued operation of said emergency. pole changer.

JOHN SHAVER. 

